Endurance Short Stroke BBC
11-02-2017, 08:00 AM
#21
Platinum Member
tyler,a 509 [4.500 bore 4.000 stroke]a crane 168741 hyd roller cam and your heads will exceed 600 hp.i just finished the same combination but it has a set of the engine quest heads.it is going to the dyno next week,i will post the results but i am expecting 625 + or - 10.
11-02-2017, 08:26 AM
#22
Registered
Thread Starter
a note of caution... bowtie or dart/merlin block if you're planning to go 4.560 most gen IV/6 blocks will not sonic test acceptable for wall thickness in a marine application I would strongly suggest sonic check of any block used over 4.530 to verify proper wall thickness, I've seen some crazy chit in my years...
11-02-2017, 09:10 AM
#24
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Thread Starter
11-03-2017, 07:41 AM
#25
Registered
Thread Starter
This piston in a World block 4.560" and a 741 looks good.. right around 9.1 cr. 6.385" rod 4" stroke.
338168 Product Detail Information - JE Pistons
What do you think?
338168 Product Detail Information - JE Pistons
What do you think?
11-04-2017, 07:55 PM
#26
If your going with a 4.560 World block, running 9.1 c/r, hydraulic roller cam and limiting RPM to 5500 I don't think you would be giving away anything longevity wise going to a 4.25 or even 4.50 stroke. The usable torque going to 555 or 588 inches with a 310cc head would be outstanding. You could be looking at 625+hp and 700+tq with the dock manners of a 500efi
11-06-2017, 09:43 AM
#27
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Thread Starter
If your going with a 4.560 World block, running 9.1 c/r, hydraulic roller cam and limiting RPM to 5500 I don't think you would be giving away anything longevity wise going to a 4.25 or even 4.50 stroke. The usable torque going to 555 or 588 inches with a 310cc head would be outstanding. You could be looking at 625+hp and 700+tq with the dock manners of a 500efi
11-06-2017, 09:53 AM
#28
628HP and 626HP ...LOL.... plus it was 100 degrees. I had bigger injectors, (50# once I replaced them. we only used 70% of them.. Plenty of fuel too. Despite my through honed polished, port matched intakes, they still starved for air after 5500. I have the arizona speed throttle bodies too. They were not 509, by the way, they were 522. I was happy with the performance of Al's heads, and I reached my goal. My ultimate goal was 625, and that is exactly where I landed.
11-06-2017, 09:57 AM
#29
Registered
Thread Starter
628HP and 626HP ...LOL.... plus it was 100 degrees. I had bigger injectors, (50# once I replaced them. we only used 70% of them.. Plenty of fuel too. Despite my through honed polished, port matched intakes, they still starved for air after 5500. I have the arizona speed throttle bodies too. They were not 509, by the way, they were 522. I was happy with the performance of Al's heads, and I reached my goal. My ultimate goal was 625, and that is exactly where I landed.
Thanks
